Natural death is necessary . . . But should happen in old age, which should be reached at actual chronological old age. It should be a shorter period than youth and middle age and can be delayed by healthy lifestyle. IMO.

You might want to YouTube a guy named Dan Winters. He is SUPER FASCINATING. He's really into raw foods, DNA, tons of esoteric things, and talks about how the perfect death in a fractal, nature-based environment will allow the soul to leave the body in the most coherent state intact. Sacred death. Pretty cool.

Kind of out there, but totally worth the time. He's got lots of books, and degrees....